Loss of Performance. The oils from your skin will breakdown the silicone, plastic and rubber making CPAP masks less efficient over time.
Discoloration. If parts of your CPAP mask, tubing or water chamber are yellow or cloudy, it is time to replace them. Those are clear signs of build-up that can’t be washed away.
Odour. If it smells funky, it's got to go! Even if you clean them regularly, CPAP parts can hide mould and mildew inside. This could mean you are breathing in bacteria and pathogens when you sleep.
Irritated Skin. There are a number of reasons why you might be breaking out in a rash or have irritated skin; sometimes your mask might be too tight. But a buildup of facial oils on your CPAP mask could cause irritation too.